CN214544866U - Constant voltage light-dimming MOS tube driving circuit - Google Patents
Constant voltage light-dimming MOS tube driving circuit Download PDFInfo
- Publication number
- CN214544866U CN214544866U CN202120555752.XU CN202120555752U CN214544866U CN 214544866 U CN214544866 U CN 214544866U CN 202120555752 U CN202120555752 U CN 202120555752U CN 214544866 U CN214544866 U CN 214544866U
- Authority
- CN
- China
- Prior art keywords
- triode
- transistor
- constant
- voltage
- control module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to a technical field that lamps and lanterns adjusted luminance especially relates to a MOS pipe drive circuit adjusts luminance of constant voltage. The constant-voltage output circuit comprises a constant-voltage output circuit, an MOS (metal oxide semiconductor) tube and a drive control circuit; the source electrode and the drain electrode of the MOS tube are connected in series on the constant voltage output circuit, and the grid electrode is connected with the output end of the drive control circuit; the driving control circuit comprises a driving power supply, a first triode and a boosting control module; a collector and an emitter of the first triode are respectively connected with the output end of the driving power supply and the grid of the MOS tube, and the base is connected with the output end of the driving power supply through a first current-limiting resistor; one end of the boost control module is grounded, the other end of the boost control module is connected with the base level of the first triode, and the control end of the boost control module is connected with the PWM signal end of the singlechip; the boost control module controls the on-off between the base level of the first triode and the ground wire. The utility model discloses can step up singlechip PWM signal to guarantee that the output voltage after stepping up is the same with PWM signal phase place, improved constant voltage lamp area drive circuit's practicality, guaranteed the market competition of product.
Description
Technical Field
The utility model relates to a technical field that lamps and lanterns adjusted luminance especially relates to a MOS pipe drive circuit adjusts luminance of constant voltage.
Background
At present, the market demands lamp dimming products increasingly, and particularly, the demands of users on lamps are also increasing. At present, the lamp area drive adopts constant voltage drive power supply usually to add singlechip control circuit and adjust luminance MOS nest of tubes through the output and constitute, realize the function of adjusting luminance. The method is low in cost and good in dimming effect, but the output voltage of the single chip microcomputer is only 5V and the driving current is very weak, and the driving voltage of the power MOS is generally more than 5V, so that the MOS tube can be completely opened, and a very large driving current is needed. The single chip microcomputer on the market generally can not directly drive the power MOS tube, and the MOS drive circuit must be added in the middle to ensure the normal work of dimming.
The driving circuit in the current market is generally a totem pole driving circuit, which is widely used due to its simple structure. However, the conventional totem-pole driving circuit does not have the function of changing the driving voltage, is high in cost and slow in turn-off speed, and cannot meet the current requirement of light strip dimming.
Disclosure of Invention
The utility model discloses a solve present lamps and lanterns drive circuit and do not possess function, with high costs, the slower technical problem of turn-off speed that changes driving voltage, provide a constant voltage MOS pipe drive circuit of adjusting luminance.
In order to solve the technical problem, the technical scheme of the utility model as follows:
a constant voltage dimming MOS tube driving circuit comprises a constant voltage output circuit, an MOS tube and a driving control circuit; the source electrode and the drain electrode of the MOS tube are connected in series on the constant voltage output circuit, and the grid electrode of the MOS tube is connected with the output end of the drive control circuit; the drive control circuit comprises a drive power supply, a first triode and a boost control module; a collector and an emitter of the first triode are respectively connected with the output end of the driving power supply and the grid of the MOS tube, and a base is connected with the output end of the driving power supply through a first current-limiting resistor; one end of the boosting control module is grounded, the other end of the boosting control module is connected with the base electrode of the first triode, and the control end of the boosting control module is connected with the PWM signal end of the single chip microcomputer; and the boost control module controls the on-off between the base electrode of the first triode and the ground wire according to the signal input of the PWM signal end.
Further, the boost control module comprises a second triode and a third triode; the collector and the emitter of the second triode are respectively connected with the base and the ground wire of the first triode; the collector and the emitter of the third triode are respectively connected with the base of the second triode and the ground wire, and the base is connected with the PWM signal end; and the collector of the third triode is also connected with the output end of the driving power supply through a second current-limiting resistor.
Further, a pull-down resistor is arranged at the base of the third triode.
Further, the first triode, the second triode and the third triode are all NPN type triodes.
Furthermore, a diode is connected in series between the emitter and the base of the first triode, and the input end of the diode is connected with the emitter of the first triode.
Furthermore, an anti-interference resistor is connected in series between the emitter of the first triode and the drain of the MOS tube.
Further, the voltage value of the driving power supply is 10-15V.
Further, the constant voltage output circuit comprises a constant voltage lamp strip and a constant voltage power supply; the input end in constant voltage lamp area is connected with constant voltage power supply's output, and the output passes through MOS pipe ground connection.
The utility model discloses a drive circuit can boost to singlechip PWM signal to guarantee that the output voltage after boosting is the same with the PWM signal phase place, thereby reliable promotion the drive voltage of MOS to carry out quick discharge with diode D1, when having reduceed the drive circuit cost, improved the turn-off speed of MOS pipe, improved constant voltage lamp area drive circuit's practicality, guaranteed the market competition of product.
Drawings
Fig. 1 is a circuit structure diagram of a constant voltage dimming MOS transistor driving circuit according to an embodiment of the present invention.
Fig. 2 is a block diagram of a constant voltage dimming MOS transistor driving circuit according to an embodiment of the present invention.
Wherein:
the boost control module is 10.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
Fig. 1 shows a circuit structure diagram of the constant voltage dimming MOS transistor driving circuit according to the present embodiment.
As shown in fig. 1, the present embodiment provides a constant voltage dimming MOS transistor driving circuit, which is configured to convert a 5V PWM signal output by a single chip microcomputer into a PWM waveform having a voltage close to a driving power VDD and a larger driving current, and further configured to drive a dimming MOS transistor to perform dimming on an LED lamp or a light strip.
Referring to fig. 1-2, the constant voltage driving circuit mainly includes a constant voltage output circuit, an MOS transistor and a driving control circuit, wherein, in terms of function, the constant voltage output circuit includes a constant voltage LED strip, which is mainly used for providing a constant voltage input for the constant voltage LED strip, and the MOS transistor is connected in series to the constant voltage output circuit and is used for performing dimming control on the constant voltage LED strip. In order to solve the problem that the single chip microcomputer signal cannot reach the drive voltage of the MOS tube, the drive control circuit is arranged between the single chip microcomputer signal and the MOS tube control end and used for improving the drive voltage and the drive current of the single chip microcomputer signal so as to realize reliable drive of the MOS tube.
Specifically, in the aspect of structure, the source and the drain of the MOS transistor are connected in series to the constant voltage output circuit, the gate is connected to the output end of the drive control circuit, the gate of the MOS transistor serves as the control end of the MOS transistor, and the MOS transistor realizes dimming of the constant voltage light band according to the signal input of the gate. On the other hand, the driving control circuit comprises a driving power supply, a first triode Q1 and a boosting control module 10, wherein a collector and an emitter of the first triode Q1 are respectively connected with an output end of the driving power supply and a gate of the MOS transistor, a base of the first triode Q1 is connected with an output end of the driving power supply through a first current limiting resistor R2, one end of the boosting control module 10 is grounded, the other end of the boosting control module is connected with a base of the first triode Q1, and a control end of the boosting control module is connected with a PWM signal end of the single chip microcomputer. Further, the boost control module 10 controls the on/off between the base of the first transistor Q1 and the ground according to the signal input of the PWM signal terminal.
More specifically, when the PWM signal output by the single chip microcomputer is at a high level, the boost control module 10 turns off the base and the ground of the first transistor Q1, the gate of the MOS transistor is at a high level, and the MOS transistor is turned on. When the single chip outputs a PWM signal at a low level, the boost control module 10 turns off the base and the ground of the first transistor Q1, the gate of the MOS transistor is at a low level, and the MOS transistor is turned off.
Referring to fig. 1-2, some embodiments of the present invention are described below.
In some embodiments, the boost control module 10 specifically includes a second transistor Q2 and a third transistor Q3, wherein a collector and an emitter of the second transistor Q2 are respectively connected to a base and a ground of the first transistor Q1, a collector and an emitter of the third transistor Q3 are respectively connected to a base and a ground of the second transistor Q2, and the base is connected to the PWM signal terminal. In addition, the collector of the third transistor Q3 is also connected to the output terminal of the driving power supply through a second current limiting resistor R3. The advantage of design like this lies in, singlechip PWM signal carries out twice voltage direction through third triode Q3, second triode Q2 and changes, when guaranteeing that the phase place of output voltage is the same with the PWM phase place of singlechip output, has promoted the drive voltage of MOS to the voltage that has similar with VDD with the 5V voltage of original singlechip output.
It should be noted that the first current limiting resistor R2 and the second current limiting resistor R3 are used to provide proper operating currents for the first transistor Q1 and the second transistor Q2
Preferably, a pull-down resistor R4 is disposed at the base of the third transistor Q3, and the pull-down resistor R4 is mainly used to prevent the circuit from being disturbed and causing false triggering. It should be noted that, in the present embodiment, the first transistor Q1, the second transistor Q2, and the third transistor Q3 are all NPN transistors.
Preferably, a diode is connected in series between the emitter and the base of the first transistor Q1, and the input terminal of the diode is connected to the emitter of the first transistor Q1. The working principle of the scheme is as follows:
when the single chip microcomputer outputs a PWM signal at a high level, the third triode Q3 is conducted, the collector output of the third triode Q3 is at a low level, the second triode Q2 is turned off, the collector output of the second triode Q2 is at a high level, so that the first triode Q1 is instantly turned on, the diode D1 is turned off, the VDD voltage of the driving power supply supplies current for the MOS tube through the first triode Q1, the voltage on the grid electrode of the MOS tube is equal to the VDD voltage minus the turn-on threshold voltage of the first triode Q1, and the MOS tube is turned on.
When the single chip microcomputer outputs the PWM signal at a low level, the third triode Q3 is cut off, the collector of the third triode Q3 is at a high level, so that the second triode Q2 is conducted, the collector of the second triode Q2 is at a low level, the first triode Q1 is cut off, the D1 is conducted in the forward direction, electric charges on the grid electrode of the MOS tube are discharged through the diode D1 and the second triode Q2, the voltage on the grid electrode of the MOS tube is pulled to be at a low level, and the MOS tube is cut off.
In some embodiments, an anti-interference resistor R1 is connected in series between the emitter of the first transistor Q1 and the drain of the MOS transistor. In addition, the voltage value of the driving power supply of the present embodiment is preferably 10 to 15V.
In the aspect of the constant voltage output circuit, in some embodiments, the constant voltage output circuit specifically comprises a constant voltage lamp strip and a constant voltage power supply, wherein an input end of the constant voltage lamp strip is connected with an output end of the constant voltage power supply, an output end of the constant voltage power supply is connected with the ground through an MOS (metal oxide semiconductor) tube, and when the MOS tube is switched on, the constant voltage power supply can provide a constant voltage input for the constant voltage lamp strip.
The benefit of this embodiment lies in, this drive circuit can step up by singlechip PWM signal to guarantee that the output voltage after stepping up is the same with the PWM signal phase place, thereby reliable promotion the drive voltage of MOS, and carry out quick discharge with diode D1, when having reduceed the drive circuit cost, improved the turn-off speed of MOS pipe, improved constant voltage lamp area drive circuit's practicality, guaranteed the market competitiveness of product.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A constant voltage dimming MOS tube driving circuit is characterized by comprising a constant voltage output circuit, an MOS tube and a driving control circuit; the source electrode and the drain electrode of the MOS tube are connected in series on the constant voltage output circuit, and the grid electrode of the MOS tube is connected with the output end of the drive control circuit; the drive control circuit comprises a drive power supply, a first triode and a boost control module; a collector and an emitter of the first triode are respectively connected with the output end of the driving power supply and the grid of the MOS tube, and a base is connected with the output end of the driving power supply through a first current-limiting resistor; one end of the boosting control module is grounded, the other end of the boosting control module is connected with the base electrode of the first triode, and the control end of the boosting control module is connected with the PWM signal end of the single chip microcomputer; and the boost control module controls the on-off between the base electrode of the first triode and the ground wire according to the signal input of the PWM signal end.
2. The constant-voltage dimming MOS transistor driving circuit as claimed in claim 1, wherein the boost control module comprises a second transistor and a third transistor; the collector and the emitter of the second triode are respectively connected with the base and the ground wire of the first triode; the collector and the emitter of the third triode are respectively connected with the base of the second triode and the ground wire, and the base is connected with the PWM signal end; and the collector of the third triode is also connected with the output end of the driving power supply through a second current-limiting resistor.
3. The constant-voltage dimming MOS transistor driving circuit as claimed in claim 2, wherein a pull-down resistor is disposed at a base of the third transistor.
4. The driving circuit of claim 2, wherein the first transistor, the second transistor and the third transistor are NPN transistors.
5. The constant-voltage dimming MOS transistor driving circuit as claimed in any one of claims 2-4, wherein a diode is connected in series between the emitter and the base of the first transistor, and the input terminal of the diode is connected to the emitter of the first transistor.
6. The driving circuit of the constant voltage dimming MOS transistor according to any one of claims 1-4, wherein an anti-interference resistor is connected in series between the emitter of the first transistor and the drain of the MOS transistor.
7. The constant-voltage dimming MOS transistor driving circuit as claimed in any one of claims 1 to 4, wherein the voltage value of the driving power supply is 10-15V.
8. The constant-voltage dimming MOS tube driving circuit as claimed in any one of claims 1-4, wherein the constant-voltage output circuit comprises a constant-voltage light strip and a constant-voltage power supply; the input end in constant voltage lamp area is connected with constant voltage power supply's output, and the output passes through MOS pipe ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120555752.XU CN214544866U (en) | 2021-03-17 | 2021-03-17 | Constant voltage light-dimming MOS tube driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120555752.XU CN214544866U (en) | 2021-03-17 | 2021-03-17 | Constant voltage light-dimming MOS tube driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214544866U true CN214544866U (en) | 2021-10-29 |
Family
ID=78263935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120555752.XU Active CN214544866U (en) | 2021-03-17 | 2021-03-17 | Constant voltage light-dimming MOS tube driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214544866U (en) |
-
2021
- 2021-03-17 CN CN202120555752.XU patent/CN214544866U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111432528B (en) | LED driving power supply and controller thereof | |
| CN108173425A (en) | A kind of start-up circuit | |
| CN204031553U (en) | A kind of LED drive circuit and soft starting circuit thereof | |
| CN106533144B (en) | Anti-reverse and current flowing backwards circuit | |
| US9814107B2 (en) | Drive circuit and illumination device comprising the drive circuit | |
| CN214544866U (en) | Constant voltage light-dimming MOS tube driving circuit | |
| CN110868062B (en) | Half-bridge driving circuit and control method thereof | |
| CN218830718U (en) | Turn-off afterglow eliminating circuit and LED driving power supply | |
| CN114362501B (en) | Dynamic anti-backflow circuit for wireless charging synchronous rectifier bridge and working method thereof | |
| CN212910120U (en) | LED power supply dimming circuit | |
| CN115314038A (en) | Gate-level buffer circuit based on SiC power device | |
| CN210202140U (en) | LED induction lamp control circuit based on LED constant current driving power supply | |
| CN212992001U (en) | Light-operated boost circuit with turn-off function | |
| CN210093621U (en) | Isolated PWM multi-group lamp dimming circuit | |
| CN108924997B (en) | Two-stage light adjusting circuit | |
| CN218456546U (en) | Dimming turn-off control circuit of non-isolated power supply and non-isolated power supply | |
| CN213152431U (en) | Non-isolation turn-off low-standby-power-consumption dimming circuit | |
| CN210405724U (en) | Contactless large-current MOS tube driving circuit | |
| CN220190848U (en) | Switch tube driving circuit | |
| CN217849732U (en) | Protection circuit for automobile lamp and automobile lamp with protection circuit | |
| CN216057579U (en) | Heavy current control circuit based on rain-proof short circuit interference | |
| CN210670661U (en) | Undervoltage protection circuit | |
| CN217160059U (en) | Color temperature switching circuit of LED power supply and LED power supply | |
| CN210867162U (en) | Full-voltage input overcurrent protection circuit | |
| CN221202811U (en) | Short-circuit protection circuit, LED driving power supply and lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |